Added unpack alignment tests.

tests/angle_tests/UnpackAlignmentTest.cpp

+#include "ANGLETest.h"
+
+#include <array>
+
+class UnpackAlignmentTest : public ANGLETest
+{
+protected:
+    UnpackAlignmentTest()
+    {
+        setWindowWidth(128);
+        setWindowHeight(128);
+        setRedBits(8);
+        setGreenBits(8);
+        setBlueBits(8);
+        setAlphaBits(8);
+        setDepthBits(24);
+
+        mProgram = 0;
+    }
+
+    virtual void SetUp()
+    {
+        ANGLETest::SetUp();
+
+        const std::string vertexShaderSource = SHADER_SOURCE
+        (
+            precision highp float;
+            attribute vec4 position;
+
+            void main()
+            {
+                gl_Position = position;
+            }
+        );
+
+        const std::string fragmentShaderSource = SHADER_SOURCE
+        (
+            uniform sampler2D tex;
+
+            void main()
+            {
+                gl_FragColor = texture2D(tex, vec2(0.0, 1.0));
+            }
+        );
+
+        mProgram = compileProgram(vertexShaderSource, fragmentShaderSource);
+        if (mProgram == 0)
+        {
+            FAIL() << "shader compilation failed.";
+        }
+    }
+
+    virtual void TearDown()
+    {
+        glDeleteProgram(mProgram);
+
+        ANGLETest::TearDown();
+    }
+
+    void getPixelSize(GLenum format, GLenum type, unsigned int* size)
+    {
+        switch (type)
+        {
+          case GL_UNSIGNED_SHORT_5_5_5_1:
+          case GL_UNSIGNED_SHORT_5_6_5:
+          case GL_UNSIGNED_SHORT_4_4_4_4:
+            *size = sizeof(GLushort);
+            break;
+
+          case GL_UNSIGNED_BYTE:
+            {
+                unsigned int compCount = 0;
+                switch (format)
+                {
+                  case GL_RGBA:            compCount = 4; break;
+                  case GL_RGB:             compCount = 3; break;
+                  case GL_LUMINANCE_ALPHA: compCount = 2; break;
+                  case GL_LUMINANCE:       compCount = 1; break;
+                  case GL_ALPHA:           compCount = 1; break;
+                  FAIL() << "unknown pixel format.";
+                }
+                *size = sizeof(GLubyte) * compCount;
+            }
+            break;
+          default:
+            FAIL() << "unknown pixel type.";
+        }
+    }
+
+    bool formatHasRGB(GLenum format)
+    {
+        return (format != GL_ALPHA);
+    }
+
+    void testAlignment(int alignment, unsigned int offset, GLenum format, GLenum type)
+    {
+        static const unsigned int width = 7;
+        static const unsigned int height = 2;
+
+        glPixelStorei(GL_UNPACK_ALIGNMENT, alignment);
+
+        GLint readbackAlignment;
+        glGetIntegerv(GL_UNPACK_ALIGNMENT, &readbackAlignment);
+        EXPECT_EQ(alignment, readbackAlignment);
+
+        std::array<GLubyte, 1024> buf;
+        std::fill(buf.begin(), buf.end(), 0);
+
+        unsigned int pixelSize;
+        getPixelSize(format, type, &pixelSize);
+        for (unsigned int i = 0; i < pixelSize; i++)
+        {
+            buf[offset+i] = 0xFF;
+        }
+
+        GLuint tex;
+        glGenTextures(1, &tex);
+        glBindTexture(GL_TEXTURE_2D, tex);
+
+        glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, type, &buf[0]);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+        drawQuad(mProgram, "position", 0.5f);
+
+        GLubyte expectedRGB = formatHasRGB(format) ? 255 : 0;
+        EXPECT_PIXEL_EQ(0, 0, expectedRGB, expectedRGB, expectedRGB, 255);
+
+        glDeleteTextures(1, &tex);
+    }
+
+    GLuint mProgram;
+};
+
+TEST_F(UnpackAlignmentTest, default_alignment)
+{
+    GLint defaultAlignment;
+    glGetIntegerv(GL_UNPACK_ALIGNMENT, &defaultAlignment);
+    EXPECT_EQ(defaultAlignment, 4);
+}
+
+
+TEST_F(UnpackAlignmentTest, alignment_1_rgba_ubyte)
+{
+    testAlignment(1, 7 * 4, GL_RGBA, GL_UNSIGNED_BYTE);
+}
+
+TEST_F(UnpackAlignmentTest, alignment_1_rgb_ubyte)
+{
+    testAlignment(1, 7 * 3, GL_RGB, GL_UNSIGNED_BYTE);
+}
+
+TEST_F(UnpackAlignmentTest, alignment_1_rgba_ushort4444)
+{
+    testAlignment(1, 7 * 2, GL_RGBA, GL_UNSIGNED_SHORT_4_4_4_4);
+}
+
+TEST_F(UnpackAlignmentTest, alignment_1_rgba_ushort5551)
+{
+    testAlignment(1, 7 * 2, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1);
+}
+
+TEST_F(UnpackAlignmentTest, alignment_1_rgb_ushort565)
+{
+    testAlignment(1, 7 * 2, GL_RGB, GL_UNSIGNED_SHORT_5_6_5);
+}
+
+TEST_F(UnpackAlignmentTest, alignment_1_la_ubyte)
+{
+    testAlignment(1, 7 * 2, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE);
+}
+
+TEST_F(UnpackAlignmentTest, alignment_1_l_ubyte)
+{
+    testAlignment(1, 7, GL_LUMINANCE, GL_UNSIGNED_BYTE);
+}
+
+TEST_F(UnpackAlignmentTest, alignment_1_a_ubyte)
+{
+    testAlignment(1, 7, GL_ALPHA, GL_UNSIGNED_BYTE);
+}
+
+
+TEST_F(UnpackAlignmentTest, alignment_2_rgba_ubyte)
+{
+    testAlignment(2, 7 * 4, GL_RGBA, GL_UNSIGNED_BYTE);
+}
+
+TEST_F(UnpackAlignmentTest, alignment_2_rgb_ubyte)
+{
+    testAlignment(2, 7 * 3 + 1, GL_RGB, GL_UNSIGNED_BYTE);
+}
+
+TEST_F(UnpackAlignmentTest, alignment_2_rgba_ushort4444)
+{
+    testAlignment(2, 7 * 2, GL_RGBA, GL_UNSIGNED_SHORT_4_4_4_4);
+}
+
+TEST_F(UnpackAlignmentTest, alignment_2_rgba_ushort5551)
+{
+    testAlignment(2, 7 * 2, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1);
+}
+
+TEST_F(UnpackAlignmentTest, alignment_2_rgb_ushort565)
+{
+    testAlignment(2, 7 * 2, GL_RGB, GL_UNSIGNED_SHORT_5_6_5);
+}
+
+TEST_F(UnpackAlignmentTest, alignment_2_la_ubyte)
+{
+    testAlignment(2, 7 * 2, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE);
+}
+
+TEST_F(UnpackAlignmentTest, alignment_2_l_ubyte)
+{
+    testAlignment(2, 7 + 1, GL_LUMINANCE, GL_UNSIGNED_BYTE);
+}
+
+TEST_F(UnpackAlignmentTest, alignment_2_a_ubyte)
+{
+    testAlignment(2, 7 + 1, GL_ALPHA, GL_UNSIGNED_BYTE);
+}
+
+
+TEST_F(UnpackAlignmentTest, alignment_4_rgba_ubyte)
+{
+    testAlignment(4, 7 * 4, GL_RGBA, GL_UNSIGNED_BYTE);
+}
+
+TEST_F(UnpackAlignmentTest, alignment_4_rgb_ubyte)
+{
+    testAlignment(4, 7 * 3 + 3, GL_RGB, GL_UNSIGNED_BYTE);
+}
+
+TEST_F(UnpackAlignmentTest, alignment_4_rgba_ushort4444)
+{
+    testAlignment(4, 7 * 2 + 2, GL_RGBA, GL_UNSIGNED_SHORT_4_4_4_4);
+}
+
+TEST_F(UnpackAlignmentTest, alignment_4_rgba_ushort5551)
+{
+    testAlignment(4, 7 * 2 + 2, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1);
+}
+
+TEST_F(UnpackAlignmentTest, alignment_4_rgb_ushort565)
+{
+    testAlignment(4, 7 * 2 + 2, GL_RGB, GL_UNSIGNED_SHORT_5_6_5);
+}
+
+TEST_F(UnpackAlignmentTest, alignment_4_la_ubyte)
+{
+    testAlignment(4, 7 * 2 + 2, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE);
+}
+
+TEST_F(UnpackAlignmentTest, alignment_4_l_ubyte)
+{
+    testAlignment(4, 7 + 1, GL_LUMINANCE, GL_UNSIGNED_BYTE);
+}
+
+TEST_F(UnpackAlignmentTest, alignment_4_a_ubyte)
+{
+    testAlignment(4, 7 + 1, GL_ALPHA, GL_UNSIGNED_BYTE);
+}
+
+
+TEST_F(UnpackAlignmentTest, alignment_8_rgba_ubyte)
+{
+    testAlignment(8, 7 * 4 + 4, GL_RGBA, GL_UNSIGNED_BYTE);
+}
+
+TEST_F(UnpackAlignmentTest, alignment_8_rgb_ubyte)
+{
+    testAlignment(8, 7 * 3 + 3, GL_RGB, GL_UNSIGNED_BYTE);
+}
+
+TEST_F(UnpackAlignmentTest, alignment_8_rgba_ushort4444)
+{
+    testAlignment(8, 7 * 2 + 2, GL_RGBA, GL_UNSIGNED_SHORT_4_4_4_4);
+}
+
+TEST_F(UnpackAlignmentTest, alignment_8_rgba_ushort5551)
+{
+    testAlignment(8, 7 * 2 + 2, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1);
+}
+
+TEST_F(UnpackAlignmentTest, alignment_8_rgb_ushort565)
+{
+    testAlignment(8, 7 * 2 + 2, GL_RGB, GL_UNSIGNED_SHORT_5_6_5);
+}
+
+TEST_F(UnpackAlignmentTest, alignment_8_la_ubyte)
+{
+    testAlignment(8, 7 * 2 + 2, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE);
+}
+
+TEST_F(UnpackAlignmentTest, alignment_8_l_ubyte)
+{
+    testAlignment(8, 7 + 1, GL_LUMINANCE, GL_UNSIGNED_BYTE);
+}
+
+TEST_F(UnpackAlignmentTest, alignment_8_a_ubyte)
+{
+    testAlignment(8, 7 + 1, GL_ALPHA, GL_UNSIGNED_BYTE);
+}